Tough question R. Panerai straps are like Ties...a very personal choice and statement.
I think the watch case and dial matter in selecting straps. Of course, any Panerai, regardless of case finish and dial color, looks good with the PAV tan color of your existing straps.
I have a variety of straps and I am a big fan of MP straps...I also love Europelli Shell Cordovan for a dressier look....
Most of the historical straps today come with sewn in buckles so that has to be considered as well. I have tried the SC buckles but find them too bulky. My favorite for comfort are the Simona curved or MP curved Pre-V buckles...
A and B series should be 24/22 with Thumbnail buckles for accuracy if you are concerned with that.
Pre-A and Pre-V go with the Pre-V bottle opener style buckles for accuracy - branded as yours are.
Greg's Crazy Horse I straps are very nice for a casual look and feel...
For PVD, I am currently eying up Greg's Marrone Antico